Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bbd255a97a8b86…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 12:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb24e97f4aa7767333572f5e10fe367a SHA-1: 9801294d36b77301b3848921cfd4ceb2ed068346 SHA-256: f4bbd255a97a8b86e8646af07d114c63a7f1285433e47e36a606ef0d64f20904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gz-theoutfit.com/UploadFiles/FCKeditor/20210831091030.pdf In PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/xerovowerozekafafesaku.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-17/20210817074645729463.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bbbf7037ed2f9d2635dccae4fcf0ab91/sivisimuref.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/muvulora.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e40879b08---26290328026.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/32574425506.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/niwugererofov.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120fedb49ab3---vofawi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b22ni999h844rvskiup2n24v1/18253308053.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p8jim5m290tpdlhfck8tadvrf8/moxaxejegigoba.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/fejanitozixigozidebusosig.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0b70f0ab---koguzarovak.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed342bee0d---9273296480.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/60924848524.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tebunijokevonedukon.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/47944852986.pdfIn PDF document text
    • http://ud2-140.com/files/vabepixebifutonazamaxod.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/20013454911.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cea332b61---79086680660.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/51954625486.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/3547532166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hermeneutica+y+exegesis+biblica+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 17636 bytes
SHA-256: 08fe2c2ceaabd23f6667af08024b1763b87a318ff361903663776ef22a24c516
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 18488 bytes
SHA-256: 1d12eeea832d5e50e99efe96361223e5b98c284586274ff4eea74d158766a947
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 11288 bytes
SHA-256: 1f41e1d1369c497c6ecf3e0ddd51faa1594c50e35c1b677184e75dacefebac2b

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